In 
Norse mythology, 
Garm was a huge four-eyed 
dog that guarded 
Helheim, the land of the dead, living in a cave called 
Gnipa.  It was usually covered in blood.  During 
Ragnarok, Garm and 
Tyr will kill each other.
 
 
All Wikipedia text 
is available under the 
terms of the GNU Free Documentation License